Type-writing machine.



G. 0. 0ARHART- TYPE WRITING MAGHINE.

APPLIOATIONFILED AUG. 25, 1905.

923,016. Panam May 25, 1909.

)NVE/WOR.

HIS A TTORNE-Y.

WITNESSES:

STATES PATENT OFFICE.

tlii'lltG-li C. (fnltllnll. Ol'` tiltfttfUSE, NEW YORK, ASSIGNOR TO ALEXANDER T. BROWN, OF

SYRAGUSE, NEW YORK l TYPE -WRITING MACHINE.

I ne. eaaoie.

Specification of Letters Patent.

To all rtf/arm 'it concern:

Be it known that l, GEORGE C. OARHART, vcitizen of the United States, and resident of Syracuse, in the county of Onondaga and State of New York, have invented certain new' and useful 'Improvements in Typeri-itin@ Machines, of which the following` is a specification. i

My invention relates more particularly to platen release mechanisms, and is designed as an improvement on the construction .shown in the patentvof Alexander T. Brown No. 648,100, dated April 24th, 1900.

The main object of the invention is to simplify in construction and render more c 'lfective in operation this type lof platen releases.

To the above and other ends, my invention consists in the features of construction and combinations of devices hereinafter fully described and particularly pointed out in the claims. i

lnthe accompanying` drawings, Figure 1 is a fragmentary longitudinal sectional viewota platen embodying' my-invention. Fig

2 is a -view similar to Fig. 1,*but showing the parts in somewhat diierent relations, 'certain of the parts in the first.' named figure being omitted and certain oii the parts shown in full lines therein being sectioned away. Fig. 3 isa sectional view taken on a plane represented by the line v in Fig. 2. Fig. 4 is a view similar to Fig'. 8, but showing certain 'of the parts in different relations. Fig. 5 is a front elevation of the right-hand platen head; and Fig. 6 is a side elevation of the same platen head, viewed from the inside and showing' the detent for the platen ratchet rwheel added.

In' the drawings, the platen is shownA as comprisingy ay hollow wooden core 1 and a sheath or outside coverin` of rubber 2, although said platen may lstructed. Secured to the right-hand end of .the platen by wood screws 3 is a metal friction case or box 4having an outer flange 5, the periphery of which terminates flush with the rubber sheath' of the platen. The righthand platen head @comprises a hub 7, a`

ratchet wheel portion 8 and a resilient friction ring portion `9. The ratchet Awheel portion S'is provided with side or crown ratchet teeth 10 with which .a line l space pawllnot shown) is adapted tofcoperate and with peripheralvl teeth 11 with which:l

e otherwise conengages a detent roller 12 mounted ina lever 13 piroted at 14 in the platen frame, the other arm of the lever 15o-acting with a spring` 15 which constantly presses ythe roller 12 into engagement with the peripheral teeth 1 1 of the ratchet wheel. The resilient friction ring 9 is separated from the remainder of the )laten headby a 'kerf or slit 1G which exten sl almost entirely around the v'friction ring, leaving only a narrow neck or portion 17 to connect the latter with the body of the laten head. Thus the friction ring is fixedp to or united with the platen head and ratchet wheel. Opposite the connecting portion 17 the friction ring is split or cut away tovleave a' space 18 between its ends, so that the friction ring is substantially C-shaped.' v v v p The friction ring 9 of the platen head 6 enters the friction case 4 and the ratchet portion S of said platenv head abuts against the i' ace of the flange 5 of said friction case. .l portion 8a is off-set from the ratchet wheel or ring 8 and tits in the friction case near its mou th and between the ratchet ring 8 and the friction ring 9, from which latter the offset portion 8 is separated by the kerf 16 and with which it is connected by the portion 17.

The portion 8al of the ratchet ring fits Within the mouth of the friction case tightly enough to exclude dust, but the fit is such that the platen when released may turn readily on the platen head, the friction case 4 bearing on the off-set portion 8*.-

A platen axle 19y passes freely through a perforation in the hub 7 of the right-hand platen head and extends through the core of the platen and 'through a left-hand vlaten head 20 with which said platen axle isy xeclly connected by a pin or screw 21, said platen head being .connected with the platen core 1 'by wood screws 201.- The ends of the platen axle are provided with the usual` knurled finger Wheels 22 and 23..

An operating lever 24-is provided with a pivot pm pgtsltud 25 nearits right-hand end, said pin or d being received 1n a perforation26 in the cylindmca1hub`7 ofthe platen headf. The lever 24 is formed with an arm 27 extending radially outward at its righth'and end andenterng the space 18 betweenv the ends of the friction'ring 9,-the arm v27 being rectan ular in cross section. vThe' longer arm o the lever 24 extends inwardly 7 Patented May 25, 1909.

`or toward the left 'and isoiY-et so'astollo I.

i closely approach the `platen axle, the end of the arm being formed with a bevel 28.A The .beveled end 28 of the operating lever 24 is adapted to contact with a tapered member or cone 29 loosely mounted upon theplaten axle 19 so that it may rotate on said platen axle and may also be slid longitudinally of the latter. 'To the left of the cone 89acollar v30 is fixed to the platen axle by a screw 31,

and confined between the collar 30 and the cone 29 is a wire spring 32 which is coiled around the platen axle and tends constantly to press the cone 29 outwardly or toward the right. y

A release rod 33 is slidably mounted within the platen axle 19, entering a longitudinal perforation 34 formed in the latter at its right-hand portion. The right-hand end of the release rod terminates exteriorly of the platen wheel'23 and is provided with a iinger piece or abutment 35. The release rod 33 is provided near its left-hand end'with Va cross'pin 36 which extends diametrically of the lplaten axle 19ypassing through slots `37 inthe latter. The 'ends of the cross pin f. 36 are positioned to contact ywith the smaller or right-hand end of the cone 29.

The parts having been properly assembled, the bevel 28`at`the inner'or-left-hand end of the operating lever24 is engaged by the cone 29 and the" inner or longer arm of said lever will be forced outwardly or toward the surface of the platen by the pressure of the spring 32 acting through the cone 29.

portion 27 of said lever to engage withthe endsof the split friction ring9, expanding the latter against the innate' spring tensionof its resilient arms, and forcing it in close contact with the inner surface of the friction .case 4.- It will be observed that thepowerarm ofthe operating lever is quite long, ex-

j' tending from the fulcrum 25 of the lever to rl5-,the bevel 28, while .the load arms; of said 1 @lever are comparatively short, extending from `the fulcrum 25 vtothe corners of the rectangular ,portion .27. This arrangement "enables the lever 24'to exert comparatively great ,power on the-ends lof the friction ring 9, causing the latter to frictionally engage or ip 'the inner face of the friction case 4 ,wit a-.pressure so great that durin the normal operatizonof themachine the frictionring 9and thefrictionjca'se 4 will be forced to move .in unison. The parts when inthe u' f normal relations just referred to will bein the positions illustrated lin Figs.' l, 2 and 3. r The friction case 4 is in effect a tionl of the platen, servin as an inner lining vfor the latter at the rig t-hand end. The

friction ring or spring with the ratchet wheel when thelspring ring and the f I ring case are' 1n frictlonal engagementv 'an the ratchet 1s movement of the longer arm `of the' lever causes the corners of the rectangulzi.-'r`

betweenthe spring ring9" is'l iiigral 8: Consequently' wheel is turned by the line spacing mechaib ism, the platen will turnor rotate with said ratchet wheel, The rotary position of the -ratchet Wheel, and consequently of the platen, is controlled by the spring-pressed detent roller l12 which is inv constant engagement with the teeth 11 of thevratchet Wheel portion 8 of the righthand platen head. Consequently, during the regular line spacing operation, the rotary movement of the plateny is limited to 4a distance corresponding to one or more teeth 11 of the ratchet wheel, The platen may be rotated regular line space distances, either-by usually employed line space mechanism or by turning either the lrnob 22 or the knob 23.

When it is desired to rotate the platen I variable distances, (by which is meant distances greater or less than the distances determined'by the spacing ofthe ratchet teeth 11) Ifor the purpose of writing upon blanks, printed forms,- ruled paper or the like, the linger button 35 is pressed inwardly or toward the left, giving a leftward longitudinal movement to the release rod 33 and causing the cross -pin 36 at the leftehand end of thel latter to slide the cone 29 leftiward along the -platen axle 19'against the pressure of the longen sides of the part 27 of the `lever 24.

The :parts-will now be in the positions represented F ig. 4 and bythe dotted lines in- Fig; 2. will be observed that the spring ring 9,` from the superior forceof the spring 32, has been permitted to contract, so that 1t now fits loosely within the friction case 4 and so 'that 'the frictional connection case and the spring ring is' broken. The result is that if the nger .button 35 is heldpressed inward or toward the left, and eitherof thev finger wheels 22 or 23 is turned, the platen, because of its u connection vwith said finger wheels through the platen head 20, rivet`or 4screw 21 and platen axle 19, will be turned `o r rotated a corresponding amount, while the right-hand' platen .head now disconnected from the -platenwillbe.maintained at rest by the detent Consequently the platen may be rotated-any desired amount without being restricted in its movementsby the line space ratchet wheel and its detent'.

When'th'e finger button 35 is released, the

forcef'of 'the spring 32 the spring rin@ 9 under the iniuence'v of, the lever 24 bleaing -'parts will be' returned tothe normal posi- Vtions shown inJFigsfl, 2"and 3, through the again expanded ivi-thin the friction case and thereby lopeiativela'r connecting' the rightiiand platen head with the platen, liy which in ,iiieai'it so connecting the tivo that said 5.

platen head, when it is actuated by the line space pawl Will canse the platen y 'to be turned orfrotated simultaneously.

The outer ends of the right andl left-liand platen .heads are closely/confined by the sideliars for ends of the vr platen frame, (not shown), so that when the frictional engage-f.

nient between the righthand platen head and the platen is broken, itis impossible for the right-hand. platen. liea'dtoslip ont of its position Within the platen; although the two members are separated so that one'may I turn freelyin respect-pf the other. Or; if

` preferred, a collar maybe fixed on tlie platen axle, abutting the outerer right-hand end of the hub T of the platen head 6.

Then the release button 35 Iis operated, it

will he noted that the pressure is 'toivard the .left5hand or inthe direction of the letter space" feeding movement -of the platen, so

that the longitudinal position o'f the latter is not altered or vdisturbed in vany Wise 'by the operation of the 'releasing mechanism.

Various changes in fthe constructionfand arrangement of the different parts may he vmade Awithin the scope of my invention.

VWhat I claim as new and desire to secure by Letters Patent, is:

l. In a typewritiiig machine, the combination of a platen; a platen head lromprising` both a ratchet portion and a friction portion; and a leverpivotally'connectedwith .said platen head and operative on said' friction portion to connect said platen head ivitlr 2. In a typewriting machine, flie combi nation of a platen; a friction casev fixed thereto; a p-latenliead comprising'a ratchet portion Without said friction case and afriction ring- Within ,lsaid friction case; and a lever pivotally connected with said platen head and operative-on said friction ring to expand the latter against said frieten case and tliereloyv to operativelyv connect said platen with said platen-head.

3. In a typewriting machine, the combination of a platen; a friction case fixed thereto; a platen head comprisinga ratclietppn- `tion Without said friction case and a friction Aring Wit-hin said friction case; a lever pivotally connected with said platen head; a

` platen axle; and spring pressed means on said platen axle, said means normallyacting on said lever to cause the latter to expand said friction ring against said lfriction lcase to operatively connect said platen with lsaidV `platen head. l

4; In a vtypevvfriting machine, the-combina'- tion of a p' aten; a friction casefixetl thereto; aplaten head comprisinga ratchet orriction without .said friction case andl a tion 'rino` Within-said. friction casea'- lever pivotally connected with said platen head; a platen axle; a cone thereon; and a spring normally pressing` said cone' outwardly setas' 5to-"-caiise saidv lever lto expand said friction ring .against saidl friction case and'thereby to 'operatively connectsaidplateii vvitli said tion oftheplaten head; a "cone loosely.

mounted on said platen axle and operativeon the loiiger'arni of said lever and a vcollar fixed to said platen axle; a coiled spring surrounding said/platen axle between said collar and said cone, said springoperating normally to 'push said -cone, outwardly tov canse the latter to actiiate saidlever to expandsaid friction .ring againstsaid frictionl case andtherehy to. frictionaily connect said platen head with said plate 6. In a typen/'i'.iting'v machine,v` tlief combination of a platen; a. platen head comprising both a ratchet ring portion and a friction ring portion; a lever pivotally .con-v nected with `said'platen head' and operative on said' friction .ring` portion in such Wise as tn coiinect said platen head with said platen ioo aiidiliand operated means adapted to actu-f' ate said lever to free said friction ring'porf tion from the control of said lever; Y i i 7.' In'a typevvriting machine, the combi'- ios vnation of va'platen; a friction case iix'edly secured' thereto; a platen head comprising a 'ratchet wheel portion outside of said friction case and a friction ring Within said l friction case; a lever pivotally connectedy with said platen `head and normally operalk tire onsaid friction ring to expand tliexlat- 4 tei" against the inner surface of saidfrict'ioii ease; and ha'iid'opera-ted means adapted to actuate said lever to release ysaid friction ring and permit it tri/contract.

`8. In atypewriitin'g machine,th e comloilnation of a platen; a vfriction caseiixed atenliead comprising a ratchet` .without said friction case and a friction thereto a ring within said 'friction case; a lever pivotally connected 'with said platen-head; a

iis

platen axle; sp-ring pressed means on saidplaten axle normally operative to cause said lev'er to expand said frictionring against the inner surface of saidfriction case;land hand operatedv release means Iadapted 'to actuate said'. lever to free said friction ringl andv permit it' to contract and spring avvayy from the. surface of ,'saidifpiction case.'

9. In a typewriting machine, the combination of a platen; a platen head comprising 4a ratchet wheel Without said friction case and a friction ring within said friction case; a lever pivoted in said platen head; a platen axle; a cone mounted thereon and normally spring pressed outward against -said lever so as t cause the latter to expand said friction ring against the inner surface of said frlction case; and a hand operated release rod adapted to move said cone leftv ward against the pressure of its spring so as to release said lever.

. i 10. In a typewriting machine, the combination of a platen; a friction case fixed thereto; a' platen head comprising a ratchet toothed portion without said friction case, a friction ring portion within said friction case, and a hub portion; a lever pivoted to said hub and operative on said friction ring; a platen axle; a cone loosely mounted on saidplaten axle and operative on said lever;

a collar fixed 'to said platen axle; a coiled spring surrounding said Yplaten axle between said collar and said cone, said spring operating normally to push said cone out wardly to cause the latter to actuate said lever to expand said friction ring against said friction case and thereby to frictionally connect said platen head with said platen; and a -release rod extending through a longitudinal perforation in said platen axle and operative to push said cone inwardly against the force of the coiled spring to release said lever and disconnect said platen head from said platen.

11. In a typewriting machine, the combi` nation of a platen; a friction casefixed thereto; a platen head comprising a ratchet toothed portion without said friction case;

a friction ring portion within said friction case. and a hub portion; a lever pivoted to said hub and operative on said friction ring; a. platen axle: a cone loosely mounted on said platen axle and operative on said lever; a collar fixed tov said platen axle; a. coiled spring' surrounding said platen axle between said collar and said cone, said spring operating normally to push, said cone outwardly, thereby actuatingl said lever to expand said friction ring againstisaid friction case and frictionally connecting said platen head with said platen; and a release rod slidably mounted 'within said platen axle and provided at its outer end with a finger button and at. its inner end with a pin operative on said cone. to force the latter inwardly, thereby freeing said lever and permitting said friction ring to spring away from the sides of said friction case to release said platen ihead from said platen.

12. In a typewriting/machine, the combination of a platen, a hollow friction case GEORGE o. CARHART. y

Witnesses:

C. E. ToMmNsoN, W. T. BREWER. 

